Double edge knife



FIG. 1 is a front view in elevation of a double edge knife showing mynew design;

FIG. 2 is a top plan view thereof, the bottom plan view being identicalthereto;

FIG. 3 is a right side view thereof, the left side view being identicalthereto; and,

FIG. 4 is a rear view in elevation thereof.

The ornamental design for a double edge knife, as shown and described.